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Sensors 2017, 17(5), 975;

Shadow-Based Vehicle Detection in Urban Traffic

Control Engineering Group, University of Cantabria, Avda. Los Castros s/n, 39005 Santander, Spain
School of Engineering, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, UK
Department of Automatics, Electronic Engineering and Industrial Computing at the Polytechnic University of Madrid, 28006 Madrid, Spain
Author to whom correspondence should be addressed.
Academic Editor: Simon X. Yang
Received: 17 March 2017 / Revised: 19 April 2017 / Accepted: 22 April 2017 / Published: 27 April 2017
(This article belongs to the Special Issue Sensors for Transportation)
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Vehicle detection is a fundamental task in Forward Collision Avoiding Systems (FACS). Generally, vision-based vehicle detection methods consist of two stages: hypotheses generation and hypotheses verification. In this paper, we focus on the former, presenting a feature-based method for on-road vehicle detection in urban traffic. Hypotheses for vehicle candidates are generated according to the shadow under the vehicles by comparing pixel properties across the vertical intensity gradients caused by shadows on the road, and followed by intensity thresholding and morphological discrimination. Unlike methods that identify the shadow under a vehicle as a road region with intensity smaller than a coarse lower bound of the intensity for road, the thresholding strategy we propose determines a coarse upper bound of the intensity for shadow which reduces false positives rates. The experimental results are promising in terms of detection performance and robustness in day time under different weather conditions and cluttered scenarios to enable validation for the first stage of a complete FACS. View Full-Text
Keywords: driving assistance systems; forward collision avoidance systems; vehicle detection; shadow detection driving assistance systems; forward collision avoidance systems; vehicle detection; shadow detection

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Ibarra-Arenado, M.; Tjahjadi, T.; Pérez-Oria, J.; Robla-Gómez, S.; Jiménez-Avello, A. Shadow-Based Vehicle Detection in Urban Traffic. Sensors 2017, 17, 975.

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